Breathing mask



FIG. 1 is a perspective view of a breathing mask according to ourdesign;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

Where included, broken lines showing environment or structure are forillustrative purposes only and form no part of the claimed design.

The ornamental design for a breathing mask, as shown and described.